On Tue, 2007-04-10 at 13:54 +0100, Patrick Caulfield wrote: > Scott McClanahan wrote: > > On Tue, 2007-04-10 at 03:37 -0400, Patrick Caulfield wrote: > >> Scott McClanahan wrote: > >>> Hello, we are running CentOS 4.3 and the latest cluster suite > >> packages > >>> from the csgfs yum repository for this release and need to delete a > >>> cluster member. According to the documentation we need to restart > >> all > >>> cluster related services on all remaining nodes in the cluster after > >> the > >>> node has been removed. This is a four node cluster so removing one > >> node > >>> obviously degrades the cluster to three nodes, but we can have the > >>> remaining cluster members recalculate the number of votes to remain > >>> quorate. It still surprises me that we have to bring down the > >> entire > >>> cluster just because we are deleting a node. Any feedback as to why > >>> this might be? > >>> > >> > >> You only need to reboot the whole cluster if you want to remove all > >> trace of the > >> node from /proc/cluster/nodes. If you're not bothered about that them > >> just > >> remove with "cman_tool leave remove" and forget about it. > >> > >> -- > >> Patrick > >> > >> Registered Address: Red Hat UK Ltd, Amberley Place, 107-111 Peascod > >> Street, > >> Windsor, Berkshire, SL4 ITE, UK. > >> Registered in England and Wales under Company Registration No. 3798903 > >> > >> -- > >> Linux-cluster mailing list > >> Linux-cluster@xxxxxxxxxx > >> https://www.redhat.com/mailman/listinfo/linux-cluster > >> > > Ok, thanks for the answer. To further elaborate my concern, if I want > > to rebuild an existing cluster member and reintroduce it to the cluster > > how do you suspect the cluster would handle that. What would be the > > best way to rebuild an existing cluster member. Other than the traces > > of node details in /proc/cluster/nodes is there any kind of state kept > > locally on these cluster nodes that would cause issues if I rebuild the > > node and attempt to transparently add it back to the cluster. > > > > Would I need to delete the cluster member from the cluster config using > > the proper utilities and then add it again? > > > > Could I avoid having to delete the cluster member at all from the > > cluster and simply rebuild/reintroduce? > > If the rebuilt node has the same node name and IP address (and cluster sofware, > obviously) then there will be no problems. The other members of the cluster will > welcome it with open arms as an old friend. > > If you give it a different name/ip address then it will appear in the cluster as > a new node and its old incarnation will remain in the list as 'dead'. > > > Why? :) > > All the existing members care about the old node is that it has the same name, > IP address and node ID. Anything else is nothing to do with them really, or can > be sorted out at run time. > Sorry to be so chatty but just to be sure (this is production), I can just rebuild the node without deleting it from the config? I will obviously need to copy the cluster.conf file to the newly built node but I thought that the node ID was "assigned" during the joining process of cluster membership. If that is the case and as long as I don't manually override the node ID, do I really have to worry about anything other than the hostname/IP? Not sure if it helps to reiterate that this is the cluster suite software built for RHEL version 4.3. > > -- Linux-cluster mailing list Linux-cluster@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/linux-cluster
